—— 请按键盘 空白键 开始游戏 ——

Learning is any change in a system that produces a more or less permanent change in its capacity for adapting to its environment.
I'm cleaning my room, cleaning my body and expanding my heart.
The most elegant proofs are those that reveal the heart of the problem with clarity.
金融创新就像火一样-它可能非常有用,但需要加以控制。
In the depth of the valley is the road to salvation.